Urethane polymers

ABSTRACT

Urethane polymers comprising the reaction product of (1) an organic polyisocyanate and (2) the product resulting from the reaction of (a) elemental phosphorus (b) an epoxide or an epithioalkane and (c) an alcohol or an alkanethiol said reaction being carried out in the presence of a catalytic quantity of a base. The aldehyde and/or alkylene oxide treated reaction product when combined with organic polyisocyanate also produce novel urethane polymers.

Inventor Chisung Wu North Brunswick, NJ. Appl. No. 826,675 Filed May 21, 1969 Patented Nov. 30, 1971 Assignee Union Carbide Corporation New York, N.Y. Original application Feb. 15, 1966, Ser. No. 527,492, now Patent No. 3,327,096. Divided and this application May 21, 1969, Ser. No. 826,675

URETHANE POLYMERS 5 Claims, No Drawings U.S. CL... ..260/77.5 AR, 260/2.5 AR, 260/5 l.5, 260/725, 260/75 NR int. Cl C08g 22/08 Field of Search 260/ 77.5 AR, 2.5 AR, 75 TN References Cited UNITED STATES PATENTS 5/l909 Mole et al. 260/775 X 3,468,983 9/l969 Praetzeletal.

OTHER REFERENCES Grayson et al. (ed Topics in Phosphorus Chemistry, Vol. l. lnterscience. NY. 1964. pp. l- 7,& l2- l6.

Saunders et al., Polyurethanes, Part I, lnterscience. N.Y.. 1962, p. 63.

Primary Examiner Donald E. Czaja Assislam ExaminerM. 1. Welsh Attorneys-Paul A. Rose. Louis C. Smith, Jr. and Clement .l.

Vicari URETHANE POLYMERS This application is a division of application Ser. No. 527,492 filed Feb. 15, 1966 and now US. Pat. No. 3,327,096.

The invention relates to a process for producing organophosphorus compositions, to the compositions produced by said process, and to various derivatives thereof. ln one aspect, the invention relates to a process which comprises reacting elemental phosphorus, an alcohol or mercaptan, and an epoxide or episulfide, in the presence of a basic catalyst. In another aspect, the invention relates to the organophosphorus compositions that are produced by the process of the invention, and to various derivatives thereof.

The process of the invention comprises reacting elemental phosphorus with an alcohol or mercaptan and an epoxide or episulfide in the presence of a basic catalyst to produce thereby an organophosphorus composition.

Elemental phosphorus is employed in the invention. White or yellow phosphorus is preferred, although the less reactive red or black phosphorus can be used if desired.

The second reactant that is employed is an alcohol or a mer captan. Any alcohol or mercaptan that is free of substituents that can destroy or deactivate the base catalyst under the reaction conditions employed can be used in the invention. Thus, the following classes of alcohols and mercaptans can be employed in the invention:

Hydroxyland mercapto-substituted alkanes and cycloalkanes such as methanol, ethanol, isopropyl alcohol, n-butanol, pentanol, hexanol, cyclopentanol, cyclohexanol, 2-ethylhexanol, isodecanol, lauryl alcohol, stearyl alcohol, ethylene glycol, propylene glycol, butylene glycol, glycerol, l,l,6-hexanetriol, pentaerythritol, xylitol sorbitol, 1,1, l trimethylolethane, l,l,l-trimethylolpropane, methyl mercaptan, butyl mercaptan, l,2-dithiol-3-hydroxypropane, and the like.

A second desirable class of alcohols are the hydroxyethers including alkylene oxide adducts of active hydrogen-containing compounds. Illustrative of such alkylene oxide adducts are diethylene glycol, triethylene glycol, dipropylene glycol, dibutylene glycol, polyo xypropylene glycols, polyoxy-ethylene glycols, mixed polyoxyethylene-polyoxypropylene glycols, polyoxybutylene glycols including polytetramethyleneoxy glycols, propylene oxide adducts of glycerol, and other ethylene oxide, propylene oxide, or butylene oxide adducts of water, methanol, ethanol, isopropyl alcohol, n-butanol, phenol and alkylphenols, ethylene glycol, propylene glycol, butylene glycol, hydroquinone, glycerol, pentaerythritol, ammonia, alkanolamines, alkylamines, aniline, adipic acid, phthalic acid, and the like. The hydroxyethers are organic compounds having at least one alcoholic hydroxyl group and at least one ether group, and which preferably contain no nonhydrocarbon substituents other than ether oxygen, hydroxyl groups, amino groups (usually tertiary amino groups), carbonyl groups, and carbonyloxy groups. The hydroxyether can be a composition having a very high molecular weight, for instance, up to about 10,000 or more, although preferably the molecular weight will be below about 5000 and more preferably below about 3500.

A third desirable class of alcohols are aminoalcohols. Illustrative of such alcohols are triethanolamine, triisopropanolamine, tributanolamine, N-methyldiethanolamine, N,N-dimethylethanolamine, N-methyldiisopropanolamine, N,N-dimethylisopropanolamine, N- ethyldiethanolamine, N-phenyldiethanolamine, and the like. The preferred aminoalcohols are the N-methyldialkanolamines and the N,N-dimethylalkanolamines.

In addition, many other alcohols can be employed including alcohols that contain olefinic unsaturation such as allyl alcohol, oleyl alcohol, linoleyl alcohol, linolenyl alcohol, and the like. The alcohol that is employed can thus be selected from many classes of compounds provided that the alcohol is substantially free of groups that would interfere with the reaction. Such groups to ,be avoided include carboxylic acid groups, phenolic hydroxyl, halo, and others that would neutralize or substantially weaken the basic catalyst.

The third reactant that is employed in the process of the invention is an epoxide or an episulfide. Epoxyalkanes are particularly useful, illustrative examples of which include ethylene oxide, propylene oxide, butylene oxide, epoxyhexane, epoxycyclohexane, epoxydecane, and the like. Also, epithioalkanes are useful, for example, ethylene sulfide, propylene sulfide, and the like, can be employed.

Epoxyalcohols can be employed in the process of the invention as the sole reactant with the elemental phosphorus, thereby supplying the epoxy and the alcohol function in a single compound. Among the useful epoxyalcohols that can be employed are 4oxatetracyclo[6.2. l .0 ".0"]undecan-9( l0 ol, glycidol, and the like.

Other types of epoxides can be employed in the invention, including polyepoxides, aminoepoxides, epoxides containing olefinic unsaturation, ester groups, ether groups, and the like. Specific illustrative examples include vinylcyclohexene dioxide, vinylcyclohexene monoxide, N-glycidyl diethylamine, epoxidized soybean oil and other such oils, the diglycidyl diether of 2,2-bis(para-hydroxyphenyl) propane, 3,4-epoxycyclohexylmethyl 3,4-epoxycyclohexanecarboxylate, bis(2,3- epoxyeyclopentyl) ether, and the like.

The alkylene oxides (i.e., epoxyalkanes) are the preferred epoxides, although for certain specialty applications other epoxides are highly useful.

The proportion of the reactants can vary widely. For example, the proportion of epoxide plus alcohol to phosphorus can vary from about 0.1 to about 10, and preferably from about 0.3 to about 3, gram-equivalents of epoxide plus alcohol per gram-atom of phosphorus. The ratio of alcohol to epoxide can vary widely, for example, from about 0.1 to about 10, and preferably from about 0.3 to about 3, equivalents of alcohol per equivalent of epoxide.

A base catalyst is employed in the invention. Alkali metal and alkaline earth metal bases are useful. Examples include sodium hydroxide, potassium hydroxide, lithium hydroxide, calcium hydroxide, magnesium hydroxide, barium hydroxide, sodium metal, potassium metal (the alkali metals will form alkali metal alcoholates in situ), potassium carbonate, sodium ethoxide, magnesium methoxide, and the like. Of the alkali and alkaline earth metal base catalysts, the preferred are the alkali metal alcoholates formed in situ by reaction of alkali metal with the alcohol reactant. Quaternary ammonium bases are highly desirable catalysts for use in the invention. Quaternary ammonium bases can be generated in situ by the interaction of an N,N-dimethylamine and an epoxide, as is illustrated by the quaternary ammonium compound formed by the reaction of N,N-dimethylamine or N,N-dimethylethanolamine with ethylene oxide or propylene oxide. Other useful quaternary ammonium bases include trimethyl-Z-hydroxyethyl ammonium hydroxide or alkoxides (which are formed by reaction of aqueous or alcoholic trimethylamine with ethylene oxide), trimethylbenzyl ammonium hydroxide or alkoxide, and the like.

The base catalyst is employed in catalytically significant quantities. The actual amount can vary widely since the catalyst can be employed in very small amounts or the catalyst can actually be one of the reactants. Thus, the catalyst can be employed in amounts of from about 0.01 mole percent to about 10 mole percent, and more preferably from about 0.1 to 6 mole percent, based on gram-atoms of phosphorus present in the reaction mixture.

The process of the invention is carried out by contacting the reactants in a suitable reaction vessel. The order of addition is not critical. The reaction temperature can vary widely, for instance, elevated temperatures of from about 25 C. to about 200 C. are suitable, and temperatures of from about 44 C. (the melting point of white phosphorus) to about C. are preferred. The reaction is carried out for a period of time sufficient to produce an organophosphorus composition minutes to about 10 hours are suitable, depending upon temperature, nature of the reactants, and the like. If desired, an inert organic diluent can be employed for the reaction. Suitable diluents include toluene, methyl isobutyl ketone, dioxane, dimethyl sulfoxide, N,N-dimethylformamide,. and the like. It is usually desirable to blanket the reaction mixture with an inert atmosphere such as nitrogen.

Standard procedures can be employed to recover the product. For instance, a convenient method is to first neutralize the catalyst, then filter and evaporate the product under vacuum to remove unreacted starting material, solvents, and the like.

The invention also provides novel organophosphorus compositions that are produced by the process of the invention. The novel compositions are usually mixtures of compounds that can be represented by Formula I:

l (RX) ,,P(R'),, wherein n is a number having a value of from 1 to 2, wherein X is oxy or thio, wherein R represents the residue after removal of the hydroxyl group of an alcohol or the sulfliydryl group of a mercaptan, and wherein R represents hydrogen, R XH or -RXP(R),,,(XR) represents a number having a value of from to 2, wherein R represents the residue after removal of the epoxy group of an epoxide, and wherein X, R, and R are as defined above. The compounds represented by Formula I can be relatively simple compounds having only one or two phosphorus atoms, or they can be relatively high molecular weight materials having up to ten or more phosphorus atoms.

Representative examples of organophosphorus compositions that are within the scope of Formula I are the following:

(a) CHJOP CH7CH OH H CH: 3 )2PCHzCH2OH (C) CHaCHrOlFCHzCHzOlFOCH;

(d) CHQS P(CH2CH2SH)2 H CH3 (this compound is within the scope of Formula I) wherein a: is l or more.

The complex nature of the organophosphorus compositions of the invention is apparent from the foregoing discussion. Said compositions contain P-H, P-C, and P-X-C groupings in varying proportions that depend to a limited extent, on the proportion of the reactants. For instance, a greater proportion of epoxide or episulfide compared with alcohol or mercaptan will generally increase the proportion of P-C groups over P-X- C groups. A relatively large proportion of alcohol or mercaptan in the reaction mixture will result in an increase in P-H groups.

The organophosphorus compositions of the invention are useful materials, particularly as reaction intermediates. For example, the compositions can be oxidized under mild conditions to convert the P-H groups to P(O)OH groups which can be neutralized with alkylene oxide to form a useful polyol. Such polyols can be employed as epoxy resin hardeners, as

coating intermediates after esterification with drying oil acids, and the like.

In one desirable embodiment of the invention, the organophosphorus compositions described above are reacted with an aldehyde in order to convert substantially all of the phosphinous hydrogen (i.e., hydrogen bonded directly to phosphorus) to hydroxymethyl (including substituted hydroxymethyl) groups. Many aliphatic and aromatic aldehydes can be employed for this purpose including formaldehyde, acetaldehyde, propionaldehyde, isobutyraldehyde, benzaldehyde, and the like. Formaldehyde is highly preferred. The aldehyde addition reaction is carried out simply by adding the aldehyde to the organophosphorus compositions and contacting until substantially all of the phosphinous hydrogen has been converted to hydroxy-methyl groups in accordance with the reactron:

wherein R represents hydrogen or an aliphatic or aromatic group. This reaction, which is usually exothermic, will take place at room temperature, although higher or lower temperatures (for example, from 20 C. to the boiling point of the aldehyde) can be employed if desired At room temperature, the aldehyde addition reaction usually takes from about 0.l to about 6 hours, after which the product can be recovered by vacuum evaporation of excess aldehyde. The aldehyde is preferably employed in proportions slightly in excess of the amount needed to react with all of the phosphinous hydrogen. The aldehyde-modified composition can subsequently be oxidized (under mild conditions such as by warming in air) to convert the organophosphorus groups to organophosphorus oxide groups, e.g., in accordance with the reaction:

wherein the variables are as identified above with respect to Formula I (modified to the extent that phosphinous hydrogen is replaced with hydroxymethyl). Such oxidation has the effect of converting trivalent phosphorus to pentavalent phosphorus.

The reaction of aldehyde with phosphinous hydrogen to form hydroxymethyl groups and the oxidation reaction discussed above are both well known types of reactions.

The aldehyde-modified compositions per se and their oxidized derivatives are polyols having wide utility. For instance, these polyols can be modified by adding ethylene oxide to form useful surfactants, they can be employed as epoxy resin hardeners, they can be esterified with drying oil acids to form surface coating compositions, and the like.

Another desirable embodiment of the invention resides in the reaction of the organophosphorus compositions of the invention with an activated olefin. An activated olefin will add to the P-l-l group, as is illustrated by the reaction:

wherein R represents a strongly electronegative group. Examples of activated olefins include acrylonitrile, acrylamide, methyl acrylate, t-butyl methacrylate, vinyl methyl ketone, vinyl methyl sulfone, and the like. The reaction conditions employed for the addition of activated olefin are essentially the same as those used for the aldehyde addition. The reaction is usually exothermic and requires no catalysts.

The compositions to which an activated olefin have been added can be oxidized under essentially the same conditions indicated above with respect to the aldehyde-modified materials.

The activated olefin-modified compositions (both per se and the oxidized derivatives thereof) are widely useful materials. They can be employed as flame-retardant additives for various polymeric systems including phenolic and epoxy resins. They are useful as antistatic agents for thermoplastic polymers, as oil additives, and sequestrants, and the like.

A further desirable embodiment of the invention resides in urethane polymers produced by reacting an organic polyisocyanate with a polyol comprising the organophosphorus compositions of the invention and/or the various derivatives thereof, in particular, the aldehyde-modified compositions.

The organic polyisocyanates which can be employed to produce the urethane polymers include tolylene diisocyanate, bis(4-isocyanatophenyl)methane, the polyisocyanates formed by phosgenation of aniline/formaldehyde condensation products, bis(2-isocyanatoethyl) fumarate, xylylene diisocyanate, and many other organic polyisocyanates that are well known in the art.

It may be desired to employ one or more additional polyols along with the phosphorus-containing polyols of the invention. Such additional polyols include polyesters, polyethers, polylactones and the like. Specific illustrative examples include polyethers comprising alkylene oxide (especially ethylene oxide, propylene oxide, or butylene oxide) adducts of glycerol, water, dipropylene glycol, ammonia, l,l,6-hexanetriol, l,l, l -trimethylolpropane, sorbitol, alpha-methyl glucoside, sucrose, aniline-formaldehyde condensation products, phenol-aniline-formaldehyde condensation products, and the like. Useful polyesters include reaction products of ethylene glycol, propylene glycol, glycerol, l,l,l-trimethylolpropane, or the like with adipic acid, phthalic acid, or the like. Lactone polymers include homopolymers of epsilon-caprolactone and copolymers of alkylene oxides and epsilon-caprolactone, and the like.

The polyol or polyol mixture employed will be selected according to the end product desired. For example, for flexible foams, a polyol having an average hydroxyl number of from about 40 to 70 is desired, for semiflexible foams or for rigid foams, polyols having average hydroxyl numbers of from about 70 to I50 or from about 125 to 7000, respectively, are useful.

The hydroxyl number is defined as the number of milligrams of potassium hydroxide required for the complete neutralization of the hydrolysis product of the fully acetylated derivative prepared from 1 gram of polyol. The hydroxyl number can also be defined by the equation:

OH: 56.1 X1000 f =m.w. where OH=hydroxyl number of the polyol f= average functionality, that is average number of hydroxylg'roupsper molecule of polyol In.w.=average molecular weight of the polyol The urethane polymers of the invention can take the form of foamed products, elastomers, surface coatings, castings and the like. The foamed products can be produced by the oneshot technique wherein all of the reactants are reacted simultaneously with the foaming operation, by the prepolymer technique, or by the quasi-prepolymer technique, all of which are well known in the art. In producing elastomers and castings, the prepolymer technique is useful. In the prepolymer technique, the isocyanate is reacted with a slightly less than stoichiometric quantity of polyol to produce a prepolymer having a low percentage (e.g., from 4 to percent) of free -NCO groups. The prepolymer is subsequently converted into an elastomer by reacting with a cross-linking agent having reactive hydrogen atoms such as a diamine, for instance, a bis(aminochlorophenyl)-methane. in producing surface coatings, there are several types of known reaction techniques which can be employed.

The amount of polyisocyanate employed will vary slightly depending upon the nature of the polyurethane being prepared. In general the total -NCO equivalent to total active hydrogen equivalent (i.e., hydroxyl plus water, if water is present) should be such as to provide a ratio of about 1.0 to 1.2 equivalents of -NCO per equivalent of active hydrogen, and preferably a ratio of about 1.05 to L1 equivalents of NCO per reactive hydrogen.

When foams are being produced, foaming can be accomplished by employing a small amount of water in the reaction mixture (for example, from about 0.5 to 5 weight percent of water, based on total weight of the reaction mixture), or through the use of blowing agents which are vaporized by the exotherm of the isocyanate-reactive hydrogen reaction, or by a combination of the two methods. All of these methods are known in the art. The preferred blowing agents are water and certain halogen-substituted aliphatic hydrocarbon which have boiling points between about 40 C. and 70 C., and which vaporize at or below the temperature of the foaming mass. lllustrative are, for example, trichloromonofluoromethane, dichlorodifluoromethane, dichloromonofluoromethane, dichloromethane, trichloromethane, and the like.

The amount of blowing agent used will vary with the density desired in the foamed product. In general it may be stated that for grams of reaction mixture containing an average isocyanate/reactive hydrogen ratio of about lzl, about 0.005 to 0.3 moles of gas are used to provide densities ranging from 30 to 1 pounds per cubic foot respectively.

Catalysts can be employed in the reaction mixture for accelerating the isocyanate-reactive hydrogen reaction. Such catalysts include a wide variety of 2.2.2.]Among the most use ful catalysts are the tertiary amines and the organic tin compounds. Specific illustrative tertiary amines include Nmethylmorpholine, N,N,N,N'-tetramethyl l ,3-butanediamine, 1,4- diazabicyclo [2.2.2]octane, bisl2-(N,N-dimethylamino)ethyl1 ether, and the like. Useful organic tin compounds include stannous octoate, stannous acetate, stannous oleate, dibutyltin diacetate, dibutyltin dilaurate, and the like. Many combinations of catalysts can be employed, for instance, it is useful to employ one or two tertiary amines in combination with stannous octoate (in making flexible foams) or dibutyltin dilaurate (in making rigid foams). The catalyst is employed in catalytic amounts such as from about 0.05 weight percent to about 6 weight percent, based on weight of polyol.

When producing urethane foams, it is useful in most cases to employ a surfactant which serves as a stabilizer in making flexible foams and as a cell size regulator in making rigid foams. Polysiloxane-polyoxyalkylene block copolymers are useful surfactants for this purpose. Among the polysiloxanepolyoxyalkylene block copolymers that are useful are those that are disclosed in U.S. Pat. Nos. 2,834,748 and 2,9l7,480 (Bailey et al. and 2,846,458 (Haluska). The surfactant is normally employed in amounts of from about 0.01 to about 2 weight percent, based on weight of polyol.

An excellent summary of urethane polymer chemistry and technology is found in the text by Saunder and Frisch, PolyurethaneszChemistry and Technology, lnterscience Publishers, New York. Part 1, Chemistry," was published in 1963 and Part II, Technology, in I964.

The urethane polymers of the invention have wide utility. For instance, they can be employed as elastomers, rigid and flexible foams, coatings, and the like. The wide utility as gaskets, sealers, in insulation, cushions and padding, in paints, and the like, of such urethane polymers is well known.

The examples which follow illustrate the invention.

EXAMPLE 1 Potassium Alkoxide Catalyzed Reaction of Phosphorus with Propylene Oxide and Propylene Glycol To a 500-ml. four-necked flask equipped with a stirrer, thermometer, Dry lee-acetone condenser, and a dropping funnel were charged 6.2 g. of yellow phosphorus and 70 g. of propylene glycol. The mixture was heated to 50 C. under a nitrogen atmosphere, and then cooled gradually with vigorous agitation to prepare phosphorus sand. To the mixture was added 35 g. of propylene oxide, and 0.24 g. of potassium dissolved in 12 g. of propylene glycol. After heating for hours at A mixture of 6.2 g. of yellow phosphorus, 2 ml. of propylene oxide, and 0.9 g. of N,N-dimethylethanolamine was heated to 45 C. To the resulting red molten mixture was added dropwise a mixture of 11.6 g. of propylene oxide and 12.8 g. of

the p p s was consumed complet y. leaving 5 methanol. Phosphorus was completely consumed after 0.5 a Viscous colorless q having a Phosphine Odorhour at 4575 C. Evaporation of the reaction mixture gave [8 g. ofa lightyellow, water-insoluble, viscous liquid contain- EXAMPLES 2-12 ing 27 percent P. Potassium Alkoxide Catalyzed Reaction of Phosphorus with 10 EXAMPLE l6 Alcohol-Epoxide Mixtures Formaldehyde Derivative of the Product from Example Vanous combinations of alcohols and epoxtdes were reacted with white phosphorus under the conditions sum- The product from example 15 was treated with 16 ml. of 37 marized in table l. A catalytic amount of potassium metal was 15 p rcen que form ldehy and hen with 6 ml. of 3 peradded at room temperature to the alcohol or to the reaction cent hydrogen peroxide. After evaporation of the reaction mixture, and then the reaction mixture was heated to reflux mixture, there was obtained a colorless viscous liquid having while vigorously stirred under nitrogen. When phosphorus was 1 .7 percent P- completely consumed, the reaction mixture was evaporated In another experiment, the formaldehyde-modified product under vacuum (0.5 mm. Hg.) at 4050 C. to constant weight. was oxidized by air until the silver nitrate test for the PH bond TABLE I Reaction Ex. No. Alcohol M01 1 Epoxicle M01 1 K, Percent 1 Temp., C. Time, hr

2 n-Propanol 1.0 Propylene oxide..... 1.7 2.5 42-46 1 3... Propylene glycol... 1. 5 1,2-butylene oxide... 1. 6 5 56-112 2 4... n-Butanol 1.5 Propylene oxide..... 2 5 42-63 1 5. sec-Butano1.... 1. .....do 2 5 47-56 1 6. n-Dodecanol 1. ..do 2 5 47-61 2. 5 7. n-Propanol Epoxide A 3 1. 2. 5 50-126 0.2 s. Epoxide B 2 2. 5 80-140 1 9. n-Propa incl Aminoepoxide 2 2. 6 64-75 1. 2 10.. do poxide C 2 5 53-57 1 11.. Aminoalcohol 7 Propylene oxide 2 5 46-61 0.6 12 t anol do 2.5 l 10 46-66 2. 5

1 Based on one g. atom of P.

1 G. atom percent of P.

3 Vinylcyclohexene dioxide.

4 4-oxatetracyclo[6.2.1.02,7.03,6] undecen-9(10)-o1. N-glycidyl diethylamlne.

Vinylcyclohexene monoxide.

7 N,N-dimethyl ethanolamin 5 Sodium metal.

EXAMPLE 13 Potassium Mercaptide Catalyzed Reaction of Phosphorus with n-Butyl Mercaptan and Propylene Oxide About 0.5 g. of yellow phosphorus and 5 ml. of propylene oxide were added to a test tube containing about 5 ml. of nbutyl mercaptan in which 0.05 g. of potassium metal had been dissolved. Upon warming, the reaction mixture turned deep red. The color faded when the phosphorus was consumed. The colorless solution was added to another test tube containing same reactants except potassium. Again the red color formation was observed at room temperature, and upon warming phosphorus was consumed.

EXAMPLE [4 Reaction of Phosphorus with N,N-Dimethylethanolamine (DMEA) and Propylene Oxide or Ethylene Oxide EXAMPLE l5 DMEA-Catalyzed Reaction of Phosphorus with Methanol and Propylene Oxide was negative. After evaporation to constant weight, the product was further treated with propylene oxide until the acid number was about 3. The final product had phosphorus content of 17 percent corresponding to an overall yield of percent based on phosphorus.

EXAMPLE 1? Acrylonitrile Derivative of the Product of Example IS The product from an experiment similar in all significant respects to example 15 was reacted exothermically with acrylonitrile. The characteristic infrared absorption band of the P-H group at 3.3311. disappeared and that of the CN group appeared at 4.45p., indicating the conversion of the P-H group to the PCH CH CN group.

EXAMPLE l8 DMEA-Catalyzed Reaction of Phosphorus with Methanol and 1,2-Epoxytetradecane A mixture of 6.2 g. of yellow phosphorus, 3 ml. of 1,2-epoxytetradecane and 0.9 g. of N,N-dimethyl ethanolamine was heated to 60 C. Then a mixture of 6.4 g. of methanol and 42.4 g. of 1,2-epoxytetradecane was added dropwise over a 20- minute period at 50-70 C. During the following 20 minutes, an exothermic reaction took place with a deep red color formation. When the color faded, all phosphorus was consumed. The reaction mixture was oxidized with an excess of 30 percent hydrogen peroxide and then evaporated. There was obtained 50 g. of a white semisolid which showed surface activity when dissolved in water. The sodium salt of the semisolid was also surface active.

EXAMPLE 19 Preparation of Flame Retardant Rigid Foams Three organophosphorus products were prepared by potassium alkoxide catalysis as previously described Compound 1:

TABLE III Vertical Wt., Cured, Fabric Add-on, Stiiiness, Break, Ellipse, Formulation percent F./min. state percent warp lbs. mm. Char, in. A.F., sec. Control W 6.1 162 BEL BEL 7 0 a 5. 3 166 BEL 5.4 4. 8 0 7. 300/8 {B 9.8 132 14 P-compound 1v 1'5. 0 300/8 w 14. 4 1 5.3 o Aerotex resin MW 10. 0 B 7. 7 108 15 Aerotex accellerator #5 3. 38

1 W=rinsed with tap water, washed (0.01% Amber Flakes) in a home laundry machine, and tumble dried; B=boiled 3 hrs. in

0.5% Amber Flakes and 0.2% sodium carbonate.

1 Ellipse flame test; BEL=burned entire length.

3 Vertical flame test; A.F.=after flaming.

4 Tetrakis (hydroxymethybphos honium chloride. 5 Tris-lK-aziridln lphosphine ox (is.

n I Modified melam ne-formaldehyde condensate soldb y Ameriren Cyanamid Company.

Phr Phosphorus Compound Polyol A" 80 Surfactant 1.5 40 Dibutyltin Dilaurate L5 lsocyanale (about 5% excess) 95.7

Trichlorofluorornethane An 80/20 propylene oxide/ethylene oxide adduct ofa 1:1:1 phenolzaniline1forrnaldehyde condensation product; hydroxyl number was 320.

A polysiloxane-polyoxyalkylene block copolymer.

An organic polyisocyanale prepared by phosgenation of an aniline/formaldehyde condensation product having an average of about 2.5 aromatic nuclei per molecule.

The rigid foam systems were rated nonburning as shown in table 11.

TABLE 11 Flammability Test (ASTM D1692) Foam Containing P-Compound I II III Density, pcf. 1.73 [.54 L73 Ignition, sec. l8 l7 l7 Extinguishment. sec. 37 35 36 5mm. in. 1.0 1.0 0.9

EXAMPLE 20 Preparation of Flame Retardant Cotton Fabrics Phosphorus Compound IV was prepared by treating the reaction product of phosphorus, methanol, and propylene oxide with aqueous formaldehyde, followed by air oxidation;

EXAMPLE 21 Oxidation and Esterification of the Product from Example 15 The product from an experiment similar in all significant respects to example 15 was oxidized with air at 65 C. overnight. The reaction mixture was further treated with aqueous hydrogen peroxide to ensure the complete conversion of the trivalent phosphorus groups to the pentavalent phosphorus groups. The reaction mixture was evaporated to remove water and then treated with excess propylene oxide until the acid number of the reaction mixture was essentially zero. The final product had a phosphorus content of 15 percent, corresponding to an overall yield of percent based on phosphorus.

What is claimed is:

l. A urethane polymer comprising the reaction product of (1) an organic polyisocyanate and (2) a polyol having a hydroxyl number of at least 40 and containing the composition produced by reacting (a) elemental phosphorus, (b) an epoxide or an epithioalkane, and (c) an alcohol or an alkanethiol, in the presence of a catalytic quantity of a base.

2. A urethane polymer according to claim 1 wherein said composition is reacted with an aldehyde in proportions, at a temperature, and for a period of time sufficient to convert substantially all phosphinous hydrogen in said composition to hydroxymethyl groups prior to reaction with said organic polyisocyanate.

3. A urethane polymer according to claim 2 wherein said aldehyde treated composition is subjected to the additional step of oxidation to convert substantially all of the trivalent phosphorus to pentavalent phosphorus prior to reaction with said organic isocyanate.

4. A urethane polymer according to claim 3 wherein said oxidized aldehyde treated composition is subjected to the additional step of reaction with an alkylene oxide to convert substantially all of the POH moieties in said composition to 2- hydroxyethoxyphosphorus groups prior to reaction with said organic polyisocyanate.

5. A urethane polymer according to claim 1 wherein said composition is subjected to the additional step of oxidation to convert substantially all of the trivalent phosphorous to pentavalent phosphorous, and thereafter treating the resultant composition with an alkylene oxide to convert substantially all of the POH moieties in said resultant composition to 2- hydroxyethoxyphosphorus groups prior to reaction with the organic polyisocyanate.

3333 UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. ,624,044 Dated November 30 1971 Inventor(s) hi ung Wu It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Abstract page, column 1, line 9, after 527,492, delete "now patent No. 3,327,096".

Column 1, line 3, after 527,492 filed Feb. 15, 1966, delete "and now U.S. Pat. No. 3,327,096".

Signed and sealed this 3rd day of October 1972.

(SEAL) Attest:

EDWARD M.FLETCI-LI:IR,JR. ROBERT GO'ITSCHALK Attesting Officer Commissioner of Patents 

2. A urethane polymer according to claim 1 wherein said composition is reacted with an aldehyde in proportions, at a temperature, and for a period of time sufficient to convert substantially all phosphinous hydrogen in said composition to hydroxymethyl groups prior to reaction with said organic polyisocyanate.
 3. A urethane polymer according to claim 2 wherein said aldehyde treated composition is subjected to the additional step of oxidation to convert substantially all of the trivalent phosphorus to pentavalent phosphorus prior to reaction with said organic isocyanate.
 4. A urethane polymer according to claim 3 wherein said oxidized aldehyde treated composition is subjected to the additional step of reaction with an alkylene oxide to convert substantially all of the POH moieties in said composition to 2-hydroxyethoxyphosphorus groups prior to reaction with said organic polyisocyanate.
 5. A urethane polymer according to claim 1 wherein said composition is subjected to the additional step of oxidation to convert substantially all of the trivalent phosphorous to pentavalent phosphorous, and thereafter treating the resultant composition with an alkylene oxide to convert substantially all of the POH moieties in said resultant composition to 2-hydroxyethoxyphosphorus groups prior to reaction with the organic polyisocyanate. 